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Tap water quality report

Renton, WA

EPA monitoring detected 17 contaminants across the 6 water suppliers serving Renton. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

6
water suppliers
203,262
people served
17
contaminants found
Washington rankings Lead in Washington PFAS in Washington

What was found in Renton's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
2200 µg/L 22%
of the EPA limit 10000 µg/L
Main supplier: RENTON CITY OF · 108,091 people · 2019
Highest in the city: 3200 µg/L — LAKE WILDERNESS SHORE ACRES ESTATE · 75 people · 2019
2/6 SYR4
Nitrate-Nitrite
2090 µg/L 21%
of the EPA limit 10000 µg/L
Main supplier: RENTON CITY OF · 108,091 people · 2019
Highest in the city: 3130 µg/L — LAKE WILDERNESS SHORE ACRES ESTATE · 75 people · 2019
2/6 SYR4
Fluoride
717 µg/L 18%
of the EPA limit 4000 µg/L
Main supplier: RENTON CITY OF · 108,091 people · 2019
Highest in the city: 910 µg/L — KING COUNTY WATER DISTRICT NO 90 · 20,100 people · 2016
2/6 SYR4
Total Haloacetic Acids (HAA5)
7.2 µg/L 12%
of the EPA limit 60 µg/L
Main supplier: RENTON CITY OF · 108,091 people · 2019
Highest in the city: 47.56 µg/L — SOOS CREEK WATER & SEWER DISTRICT · 74,172 people · 2019
6/6 SYR4
TTHM
18 µg/L 23%
of the EPA limit 80 µg/L
Main supplier: RENTON CITY OF · 108,091 people · 2019
Highest in the city: 46.8035 µg/L — SOOS CREEK WATER & SEWER DISTRICT · 74,172 people · 2019
6/6 SYR4
Chloroform
9.66 µg/L
No EPA limit set
Main supplier: RENTON CITY OF · 108,091 people · 2019
Highest in the city: 44.29 µg/L — SOOS CREEK WATER & SEWER DISTRICT · 74,172 people · 2019
6/6 SYR4
Copper
20 µg/L 1.5%
of the EPA limit 1300 µg/L
Main supplier: RENTON CITY OF · 108,091 people · 2019
Highest in the city: 33 µg/L — MAPLEWOOD ADDITION WATER COOP · 435 people · 2018
2/6 SYR4
Trichloroacetic Acid
4.3 µg/L
No EPA limit set
Main supplier: RENTON CITY OF · 108,091 people · 2019
Highest in the city: 32.875 µg/L — SOOS CREEK WATER & SEWER DISTRICT · 74,172 people · 2019
6/6 SYR4
Dichloroacetic Acid
3.15 µg/L
No EPA limit set
Main supplier: RENTON CITY OF · 108,091 people · 2019
Highest in the city: 20.045 µg/L — SOOS CREEK WATER & SEWER DISTRICT · 74,172 people · 2019
4/6 SYR4
Bromodichloromethane
5.68 µg/L
No EPA limit set
Main supplier: RENTON CITY OF · 108,091 people · 2019
5/6 SYR4
Monochloroacetic Acid
4.403 µg/L
No EPA limit set
Highest in the city: SOOS CREEK WATER & SEWER DISTRICT · 74,172 people · 2019
2/6 SYR4
Arsenic
1.4 µg/L 14%
of the EPA limit 10 µg/L
Main supplier: RENTON CITY OF · 108,091 people · 2019
Highest in the city: 3.5 µg/L — KING COUNTY WATER DISTRICT NO 90 · 20,100 people · 2016
2/6 SYR4
Dibromochloromethane
2.8 µg/L
No EPA limit set
Main supplier: RENTON CITY OF · 108,091 people · 2019
4/6 SYR4
Dibromoacetic Acid
1.03 µg/L
No EPA limit set
Highest in the city: RAVENSDALE WATER SUPPLY · 389 people · 2019
4/6 SYR4
Bromoform
0.9000 µg/L
No EPA limit set
Main supplier: RENTON CITY OF · 108,091 people · 2019
2/6 SYR4
Lead
0.0019 mg/L 13%
of the EPA limit 0.0150 mg/L
Main supplier: RENTON CITY OF · 108,091 people · 2025
Highest in the city: 0.0035 mg/L — LAKE WILDERNESS SHORE ACRES ESTATE · 75 people · 2017
5/6 LCR
PFBS
0.0030 µg/L
No EPA limit set
Main supplier: RENTON CITY OF · 108,091 people · 2023
1/6 UCMR-5
Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Renton

SupplierPopulation served
RENTON CITY OF 108,091
SOOS CREEK WATER & SEWER DISTRICT 74,172
KING COUNTY WATER DISTRICT NO 90 20,100
MAPLEWOOD ADDITION WATER COOP 435
RAVENSDALE WATER SUPPLY 389
LAKE WILDERNESS SHORE ACRES ESTATE 75

Frequently asked questions about Renton tap water

Is Renton tap water safe to drink?

EPA testing detected 17 contaminants in the water serving Renton. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Renton?

6 public water suppliers report drinking-water monitoring for Renton, Washington to the EPA. Each is listed above with its population served.

What contaminants are in Renton's water?

The contaminants EPA monitoring detected in Renton include Nitrate, Nitrate-Nitrite, Fluoride, Total Haloacetic Acids (HAA5), TTHM. The full list, with the level at the main supplier and the data source, is in the table above.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.